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Finding the Fourth Proportional to 205,885.60, 308,842.80 and 81,210.40

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Solution

The fourth proportional to 205,885.60, 308,842.80 and 81,210.40 is: 121,821.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,885.60 : 308,842.80 = 81,210.40 : x
  2. Step 2: Convert to fraction form
    205,885.60/308,842.80 = 81,210.40/x
  3. Step 3: Cross multiply
    205,885.60x = 308,842.80 × 81,210.40
  4. Step 4: Simplify right side
    205,885.60x = 25,081,247,325.12
  5. Step 5: Solve for x
    x = 25,081,247,325.12/205,885.60
  6. Step 6: Final answer
    x = 121,821.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.